Add missing @property on permits_inplace_modification

arraycontext/impl/pyopencl.py

@@ -436,6 +436,7 @@ class PyOpenCLArrayContext(ArrayContext):
     def clone(self):
         return type(self)(self.queue, self.allocator, self._wait_event_queue_length)
 
+    @property
     def permits_inplace_modification(self):
         return True